Malicious PDF — malware analysis report

Static analysis result for SHA-256 306ad23f75ee721d…

MALICIOUS

PDF

43.4 KB Created: 2020-04-13 22:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10b530f8ea95315feb0b4c9315c82e8d SHA-1: 8a41d8c29e1ae2deead2fa1705fb2fd424eb52e2 SHA-256: 306ad23f75ee721db0329f8f5ed520f38f7ebe9ced8973ca907fbcafe34bf7a5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure related to 'Firewall apk for android' and embeds numerous external links, many of which point to PDF files hosted on unrelated domains. This behavior is indicative of a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://caesarsnewyork.com/uploads/1/3/0/4/130435842/130435842.html#firewall+apk+for+android
    • http://realtyexpressions.org/uploads/1/3/0/8/130874615/f6b53799327.pdf
    • http://marycoeprintmaker.com/uploads/1/3/0/7/130775251/9743775.pdf
    • http://island-planet.com/uploads/1/3/1/4/131483118/gelefobuserijuf.pdf
    • http://shonee.shop/uploads/1/3/0/6/130620737/6945698.pdf
    • http://samsaracreative.net/uploads/1/3/0/6/130605269/f5415aa87ad0830.pdf
    • http://accessrealtyca.com/uploads/1/3/0/7/130739755/8869645.pdf
    • http://fdcministries.com/uploads/1/3/1/4/131483031/9107093.pdf
    • http://johndemarcorealestate.com/uploads/1/3/0/7/130776322/tunubiba.pdf
    • http://gofundmeevents.com/uploads/1/3/0/6/130639700/sosusisiba.pdf
    • http://omahaproteam.org/uploads/1/3/0/8/130874258/686a7850dd.pdf
    • http://the-hotel-academy.com/uploads/1/3/0/7/130738712/fipofowafusu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f9c.bin
8386d43ec6d579ef57ccd308fcffe6b19eceb93fef0849ab5943940c98ffd77e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9C 8956 bytes

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